summaryrefslogtreecommitdiffstats
path: root/arch/microblaze/kernel/setup.c
blob: f31ebb5dc26c21922f240545d038f0d6b5699300 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/init.h>
#include <linux/clk-provider.h>
#include <linux/clocksource.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/debugfs.h>
#include <linux/of_fdt.h>

#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <linux/io.h>
#include <linux/bug.h>
#include <linux/param.h>
#include <linux/pci.h>
#include <linux/cache.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>

#include <asm/prom.h>
#include <asm/pgtable.h>

DEFINE_PER_CPU(unsigned int, KSP);	/* Saved kernel stack pointer */
DEFINE_PER_CPU(unsigned int, KM);	/* Kernel/user mode */
DEFINE_PER_CPU(unsigned int, ENTRY_SP);	/* Saved SP on kernel entry */
DEFINE_PER_CPU(unsigned int, R11_SAVE);	/* Temp variable for entry */
DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);	/* Saved current pointer */

unsigned int boot_cpuid;
/*
 * Placed cmd_line to .data section because can be initialized from
 * ASM code. Default position is BSS section which is cleared
 * in machine_early_init().
 */
char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));

void __init setup_arch(char **cmdline_p)
{
	*cmdline_p = boot_command_line;

	console_verbose();

	unflatten_device_tree();

	setup_cpuinfo();

	microblaze_cache_init();

	setup_memory();

#ifdef CONFIG_EARLY_PRINTK
	/* remap early console to virtual address */
	remap_early_printk();
#endif

	xilinx_pci_init();

#if defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
}

#ifdef CONFIG_MTD_UCLINUX
/* Handle both romfs and cramfs types, without generating unnecessary
 code (ie no point checking for CRAMFS if it's not even enabled) */
inline unsigned get_romfs_len(unsigned *addr)
{
#ifdef CONFIG_ROMFS_FS
	if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
		return be32_to_cpu(addr[2]);
#endif

#ifdef CONFIG_CRAMFS
	if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
		return le32_to_cpu(addr[1]);
#endif
	return 0;
}
#endif	/* CONFIG_MTD_UCLINUX_EBSS */

unsigned long kernel_tlb;

void __init machine_early_init(const char *cmdline, unsigned int ram,
		unsigned int fdt, unsigned int msr, unsigned int tlb0,
		unsigned int tlb1)
{
	unsigned long *src, *dst;
	unsigned int offset = 0;

	/* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
	 * end of kernel. There are two position which we want to check.
	 * The first is __init_end and the second __bss_start.
	 */
#ifdef CONFIG_MTD_UCLINUX
	int romfs_size;
	unsigned int romfs_base;
	char *old_klimit = klimit;

	romfs_base = (ram ? ram : (unsigned int)&__init_end);
	romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	if (!romfs_size) {
		romfs_base = (unsigned int)&__bss_start;
		romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	}

	/* Move ROMFS out of BSS before clearing it */
	if (romfs_size > 0) {
		memmove(&__bss_stop, (int *)romfs_base, romfs_size);
		klimit += romfs_size;
	}
#endif

/* clearing bss section */
	memset(__bss_start, 0, __bss_stop-__bss_start);
	memset(_ssbss, 0, _esbss-_ssbss);

/* initialize device tree for usage in early_printk */
	early_init_devtree(_fdt_start);

#ifdef CONFIG_EARLY_PRINTK
	setup_early_printk(NULL);
#endif

	/* setup kernel_tlb after BSS cleaning
	 * Maybe worth to move to asm code */
	kernel_tlb = tlb0 + tlb1;
	/* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
							tlb1, kernel_tlb); */

	pr_info("Ramdisk addr 0x%08x, ", ram);
	if (fdt)
		pr_info("FDT at 0x%08x\n", fdt);
	else
		pr_info("Compiled-in FDT at %p\n", _fdt_start);

#ifdef CONFIG_MTD_UCLINUX
	pr_info("Found romfs @ 0x%08x (0x%08x)\n",
			romfs_base, romfs_size);
	pr_info("#### klimit %p ####\n", old_klimit);
	BUG_ON(romfs_size < 0); /* What else can we do? */

	pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
			romfs_size, romfs_base, (unsigned)&__bss_stop);

	pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
#endif

#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
	if (msr) {
		pr_info("!!!Your kernel has setup MSR instruction but ");
		pr_cont("CPU don't have it %x\n", msr);
	}
#else
	if (!msr) {
		pr_info("!!!Your kernel not setup MSR instruction but ");
		pr_cont("CPU have it %x\n", msr);
	}
#endif

	/* Do not copy reset vectors. offset = 0x2 means skip the first
	 * two instructions. dst is pointer to MB vectors which are placed
	 * in block ram. If you want to copy reset vector setup offset to 0x0 */
#if !CONFIG_MANUAL_RESET_VECTOR
	offset = 0x2;
#endif
	dst = (unsigned long *) (offset * sizeof(u32));
	for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
		*dst = *src;

	/* Initialize global data */
	per_cpu(KM, 0) = 0x1;	/* We start in kernel mode */
	per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
}

void __init time_init(void)
{
	of_clk_init(NULL);
	setup_cpuinfo_clk();
	clocksource_probe();
}

#ifdef CONFIG_DEBUG_FS
struct dentry *of_debugfs_root;

static int microblaze_debugfs_init(void)
{
	of_debugfs_root = debugfs_create_dir("microblaze", NULL);

	return of_debugfs_root == NULL;
}
arch_initcall(microblaze_debugfs_init);

# ifdef CONFIG_MMU
static int __init debugfs_tlb(void)
{
	struct dentry *d;

	if (!of_debugfs_root)
		return -ENODEV;

	d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
	if (!d)
		return -ENOMEM;

	return 0;
}
device_initcall(debugfs_tlb);
# endif
#endif
OpenPOWER on IntegriCloud